Pirate ghosts, mummies, and all that were Scooby-Doo standards- but every time they ended up being some guy in a mask with some plan involving scaring people away from a real treasure.

I'm not sure if there were any pirate ghosts in TOS or it's 80s/90s revivals. I want to say there were, but I can't quite remember when and where they appeared, which leads me to suspect my memories have been corrupted by Korn's Groovy Pirate Ghost Mystery.

However, I can confirm that there are pirate ghosts in the Scooby Off-Broadway Musical, at least one of the Scooby Doo interactive children's books, and the official Scooby Doo internet browser game.

Note: while these are officially licensed Scooby works, they were all created within the past decade, so it's entirely possible (likely, even) that their use of pirate ghosts is simply a nod to the fan meme.

OH! Wait! Disregard, cocks and so forth.

According to Scoobypedia, there was a pirate ghost in SDWAY s1e14, "Go Away Ghost Ship": Redbeard the Pirate.

This is why we keep EvilHomer around. None of you other punks was willing to question my integrity as a cartoon dork. Only he had the balls.

But he'll never take my Intercontinental belt.

CM Punk's pegged for the Flintstones/WWE crossover:
http://variety.com/2013/film/news/yabba-dabba-wwe-1200488834/

Yeah, seriously!

Aw, son of a bitch